I think a few UK slot dealers are bringing in some small zappers from the states, not sure of there cost or if they are physically capable of doing both the can and open frame motors, try SCD or ABSlot.
The one i use is a large ex RC motor zapper, it does all ceramic motors and open frame motors without problems, it's rated at 450Kj/sec "Class A" [whatever that means!] and looks to have been professionally built for the purpose but has no indications on it to tell me who the company was that did build it so i cannot help you on that one
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